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Hi Ron,
.ed files stores produtc structures in older ASCII format, depends of .ol files containing geometry data
.edz files are kinda "ziped" files that contains both structure and geometry data
.pvs files are similar to .ed files but in newer format wich means small files, depends of .ol files too
.pvz files are the same as edz, it contains structure and geometry data in the same file.
Hope it help you.
Guilherme Rocha
“A goal without a plan is just a wish.”